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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '756cee479514a8f6c73d57d2510db1405da1cb129691562ceebd75cd2300bde6' 
  AND token = 'PkBh3IteKiFT+U6kV7PqRrs4ht5gDGvWO9xgUAbrjxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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