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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b600cfeab088c2879d35c41bf7bcb88e696d0d4f6a98c90f7f9936c01d1a5a78' 
  AND token = 'n4ITPb9JMA4SGftsPKLtckp/SO0q6IseNwSGIP7UWto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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