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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b446e1343c2b797460845decccaa820a78d0aed0f1528624fae505af03ee89b6' 
  AND token = 'aWe7Heu0qbqQZ007m15eWB/UeBg8/ICB0Wm5zUHLHK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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