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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a339bfa57b930abb9f05ccc5c54f566593d32078cabcf91cd06b869e0ba7b3c7' 
  AND token = 'etPgXJIX61RNkAs9Lop5bBuzTOZHntjtd9vUy7vjRmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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