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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0913b8f382bd36f7dd4ab86845f7df790681b1e443a58146763c2ccca72a764d' 
  AND token = '94NPaJCKBftkrcZ81vE8U07TU43zrdZ07wHW3vabzIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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