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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7b767444c0c9192ad4de3ad314d6c79732a996641cb346b8d1111f506960a9' 
  AND token = '052wIwcyA6eLZaib35cTCmhJTbv4a5ppTVtZIeL/B+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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