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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a1e045825e2eb9d0c8831629224cafca96ef807bd1c2b67b211d2d41760c74e' 
  AND token = 'B7vicQOy3HlslO+h/dJNdjQxAY5jV+29xMVX+upa5d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}