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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7b89208c9e04ec0abf4c0e0f132ca5900eae5e6f1363972b460190853b0e39' 
  AND token = 'yheRGNcO8Gz02CqQRR7mpGHQZyf6n5hzjayEKufdOYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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