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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f94f7cebe19b4b61ecb7e8c3cb51207f448d89a578339bbceec0bff7ea81ef82' 
  AND token = 'h0ZE7Ohq7XUskkynciN8KCxwU6pihDvaoN89QfUMW+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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