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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b74d79784d363fceaa6ffa85a54539d732c8a95ef6052a21784e77d2ab117457' 
  AND token = 'BDaBQVZasI5kksda+2MwfmU7268lnBZcWUAKxEi6hD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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