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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17bfb1c7e00931624829c5e6dd3ac4b904d81b63d0c40f84d8a9be6cfa9c761c' 
  AND token = 'Y+qO9EaxTHl7d7DCvwG3+/hcJZz7vaaPrIPbdrbM9ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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