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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c49dd8b5b6bdf128d957d54e1c3b3e747269b6906326b1ac8c55ddcc930da18b' 
  AND token = 'UMaQKPTEXraB63N1XNkvPbhdaZmz/FaoxdX8Ocoflvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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