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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3284068a65edb9df56a43d679d47a94ba85f75f6bbb848c8d8ff94bb5ac7d42' 
  AND token = 'N3LjctGV2seYY60mMbny8qivRg5XjHT8DjyUtL8o2Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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