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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89687e1834f573aef884c302ca697553c407135a195fa3e4b05608e793075a82' 
  AND token = 'HdOBdbHTh8BqtUBZY6if4c9pHaEDwdJJB7FT6CkR+z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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