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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76543033bfb8e5a914c3329564db1670df35014710ef87ab176901174330bee0' 
  AND token = 'jG0ydD8o0K2HWTxIpp3D41rpwj3YX78hJX6xAueZ+fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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