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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '597023d1e7e74ae9bb79061b9543497bb4861ae7c7b390574be84acc7dfe11b8' 
  AND token = 'Otlb9XBRdrny8VhzVeuw0wR3Jf0iSgtpwH0KaQSj39g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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