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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e56c2cc3972e16ac559bbfa72a3df7021db95d977de12ad83afecf9d37958bb5' 
  AND token = 'fscteWljmOCWfh2F5YiaFQxEE/Hu40isUsP83HqoBLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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