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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7007b01a9177f684a5030dba7c6d870064c95c8914266fbfd3988e031dfd70' 
  AND token = 'BdPD96cZyBCrypBZYaH/MssdPiBB4aGTZQW1Biuw7xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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