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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f44227c694374e9f45a4697c7515bc21370eb9ff19b54a54a6e83d6883189aa5' 
  AND token = '5qKD6eOwUlmHD+pAAFuWxpBuZuS6Aq+lstM+H1Y17WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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