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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82edf8e828bd46f40f9b893dca1f658ae5369aabd6296606c06e2de8cdc2010a' 
  AND token = '3I04pd3WkIACmVEeRLHyTPeeL2f/La2iIBoxDCOu+0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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