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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e142e6ce1d25743fa5dd464e8c0ab718f7b8084d6afed64b995674e627d9a30' 
  AND token = 'd5KeYnzN1+ZdWe/uWApoWMqeR4uj4lVWHGO7B4N0p1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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