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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a3bd130caf56a9b4cd49e95b2d750edd26f28634c4e75bf51527ac938d69faa' 
  AND token = 'val5AloTwneq/lJ1wBCQ5n4HITe84MbDzetMgm3GiXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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