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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0bc62abbeb0786f917ec5c211c2da99555094305f37ee7c0c4c7b37c3c231b7' 
  AND token = 'jsZGhH0Iu7kqsQl0+4tr8ecwIsq4AGVtLwRwIUVpUlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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