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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7cc263bac57e8c3f2d87aa1f5f5f999ba3295667722de1fd846b918b5e13297' 
  AND token = '+vMTsKO09UWn18u8J1dAYRVkADpBmugSJkcsL1g3VTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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