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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f89bc31cb70a3a4d8927792115ecf07a0c07214a634f52840cbd64584e0bee71' 
  AND token = 'Ox4VrRSi6dW1yhR2pZlqvbjju73bulFAF7QyPTDFR8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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