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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2624c4e6e481875b37c9e6df118f10df086e4e10a3ee3fbcc842e8146904ca5b' 
  AND token = 'vOLgULXRYvxcPZj2hxXyQUEPVbdG+DsuxcEDqcn0ZdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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