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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2c7fad6cbc7b48b01155c47566c09dbd77a3e3da133b3ba28f8faae2c540cc' 
  AND token = 'vEuKfo5WaIB/A3XwiQUxw/aGRtyBxg/WDY5sgjtqFuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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