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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23513a4a52a41d19d1571a7818c5bb5d2bbf38114078d9ccf95d94004a5c7b26' 
  AND token = 'yC460SxsHReki8jHI3Qhd37ulJejVggr9eE7Xw6PRXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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