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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a170708966c4f2c2641becf74666746cab9df46acfb16ca648ebf5b200ba3ff' 
  AND token = '8ulig8Nj3yvX6jLZFQx79iYvTEY7t4zXNILL8E5bZEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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