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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c76d9ae7f84eb369254bac7fb33ec4a1fd05a1b606abfae26a40b3f97e0045' 
  AND token = 'yi8mOjzYA6kvTzRD/jA0cGBH/XKz9aSj2uRXGCkLXbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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