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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b9a119ca0bb33011a9002c68fc2dc9e74c6a2c3fb9d410e22e8ff160f8edae' 
  AND token = 'why05b1nSv3I7j4e+RfyCfWCVCibMZp6FPe3EMJrDnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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