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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c4aaa628e6b9504788abd3a7f962536bfad64353eb3e9f339bf658a838f8bea' 
  AND token = 'MPmg254RUOspjWc6cgR26cBw2YhHly35xqCQTFbLgKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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