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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6293e0813bdfdd6b9ff2c32327a44205d5c7bb6ec84be125d7e82b2a5e45f1c0' 
  AND token = 'LLbSouXVIV0+eunt1JiSo4KhIfzYeFmIyX8VsS7vjRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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