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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3db4b5b01cdcd4fe87d1399d04807f83ab79200f199279fee584090f7d92b8' 
  AND token = 'FXmnjWkrZX+2lm8XYFfk4SdTuN1hfGDhf6dpdK+1L5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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