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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67e0fd0c9b5ed9da9cd756b6b1856db3f452108866c62a0df9ee686200d96135' 
  AND token = 'ty/j3Ml+D+tfTB4TnI4M18J4wXxitNenkK6TxwEXznA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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