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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0174e33d224ef443a27c8b9cc8b493126b05238444dfa7c8446e792729ae0ec0' 
  AND token = '9MnG31ECH6+xEGZ/qHxCkbHmkpmoyg3dXVavHk4y8Vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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