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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406c24b120639876606b8e48561ac87742ba3ea9732a5f30cc7e600c115ac4da' 
  AND token = 'hLddK2G0a7YcHZKTT3YKHhHjJ6Dfc8Hv8qK9AaBPtEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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