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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1663fa467aa9c46d25122ee474d13a3926abc91616e6404b09122601c1af4b59' 
  AND token = '4TiSkPKKiM2NEBacGcz48OBwEw2545DwAceEKqN7zv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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