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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca12c4254dd3bc41d562a7eead20233986b63226c8450caa26953a524148276' 
  AND token = '4RxmoAyy0ubtp1DrNfulizy+dTHu8huPg6vKQxSOmj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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