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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e553d828c4e7ccf12802a81a45e819e6cdfad0f734673a31a1bacfc5b36c0c23' 
  AND token = 'LpZJX5688zPgfipt8kHcXdXZAhvm7E6jJVWAcu6kKBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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