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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90e4c4771232d6e2bb5cc74fe80ffef44e7323ab4edeb0bf64f847132457ea8' 
  AND token = 'YXIH99vCkRZ30TN99zGN4U/6Vsy382J/0c3IN6viZ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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