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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879b87bef8885dfc8e9a2ce150d46a627ccc109250dc87f01c61f679d2be42f0' 
  AND token = 'cHsD3jF4EtWeIxLoiSum8IqZYnd8HH5WvZxhPsNNy+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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