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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd7827fceb4cc2f040feec94d89563191ded1237f40870fe31b3603cea7cf8b' 
  AND token = 'hkOv7LsqWYMhTChcvle8MbcKvE8k25t5tfr7qvYhXag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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