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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b95d9b2e8729ffd2c43a998bcc2bb76aaf7aeb3a946b5d6088d9b2a2a8d01f68' 
  AND token = 'ybs7HUOjItsrfPGojWuGPzbKgt+a/iBNeRy4BQlIHws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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