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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c588a52beec1ee2b5dbb03dfe7db35280dc504cedd1acccde4b5cfa9bbaed41' 
  AND token = 'j4aCtLRDsv7/GCf8O47+6tSm8zB4TJN5hxjbyk1JP78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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