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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9556118f6ae4535ad99e8c1c715830a5ab9e21b20972d977bce6e3657d7267ad' 
  AND token = 'xgafhvcAhILXgsxzOcz6Ww1gPkOEki/94RgSbkCPgrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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