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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae6119465a45c03db1c5f7e29cc45538dc0a8b06eaf6072acb58c6622253a36a' 
  AND token = 'ErRiKHcn3COrnzYV0Cx1ZiY9vTFyw4D0cEPab4inIwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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