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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad6d69803e5cbabb815c9a6c8709f3a12f43398333ee792fda2b24500f9ea57' 
  AND token = 'e5WdPhlQuHtPGpX6o0ANVNy3lza8O5N762u5Eu6+7Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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