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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ae60d9c85808fbba80a6a8ba6c54d2acdc63721728706fb8f2b443244dcbb2' 
  AND token = '3Y+E/PwiOKf91kujYeVsMHuJA4gEQi4DAj3H3muktbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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