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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0caf7d206f181249e8ea1df86e9f5abf6c97b7665ffefa77c601cc0db78aef8a' 
  AND token = 'xNDb549Tw9QfGyCXSLlrh17lUHaR7/mcKQ6mPa0+z5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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